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Now that we know what a psychrometric chart is, let's put it to work.
We will follow the analysis by way of an example, that will unfold step by step.
Assuming we have a particular place in mind for a project, we will have to
obtain the climatic data for that place. This data is created by airports all
over the globe, for example, and can be found, if nowhere else, at the
individual airport logs. You can check public libraries and local universities
for climatic data as well. For our example, we will use the climatic data for
Tucson, Arizona, in the USA.
The data in color is the minimum required to carry out a psychrometric analysis.
1. City Name ...............: TUCSON
2. Country Name ............: USA
3. Latitude [deg]...........: 32.20
4. Hemisphere ..............: NORTHERN
5. Longitude [deg]..........: 111.00
6. Elevation [ft]...........: 2584.00
7. Monthly Average Atmospheric Pressure [in. Hg]:
-------------------------------------------------------------------------
JAN= 27.40 FEB= 27.40 MAR= 27.33 APR= 27.27 MAY= 27.24 JUN= 27.25
JUL= 27.31 AUG= 27.35 SEP= 27.32 OCT= 27.36 NOV= 27.38 DEC= 27.39
8. Monthly Average Hourly Solar Radiation on Hz Surface [BTU/ft2]
------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
4: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
5: 0.0 0.0 0.0 0.0 6.0 5.0 1.0 0.0 0.0 0.0 0.0 0.0
6: 0.0 0.0 3.0 25.0 58.0 55.0 21.0 15.0 8.0 0.0 0.0 0.0
7: 3.0 9.0 57.0 104.0 133.0 129.0 93.0 86.0 67.0 41.0 15.0 5.0
8: 48.0 82.0 133.0 182.0 208.0 204.0 174.0 164.0 143.0 112.0 72.0 44.0
9:108.0 151.0 203.0 247.0 269.0 264.0 237.0 232.0 210.0 174.0 129.0 99.0
10:159.0 206.0 256.0 280.0 311.0 306.0 280.0 181.0 259.0 222.0 175.0 147.0
11:193.0 241.0 287.0 266.0 334.0 328.0 305.0 299.0 286.0 245.0 201.0 161.0
12:207.0 256.0 299.0 236.0 339.0 330.0 314.0 287.0 289.0 247.0 204.0 144.0
13:199.0 249.0 288.0 167.0 328.0 315.0 302.0 260.0 274.0 229.0 186.0 109.0
14:169.0 217.0 256.0 125.0 298.0 280.0 269.0 232.0 238.0 188.0 147.0 76.0
15:120.0 167.0 203.0 102.0 248.0 227.0 220.0 194.0 179.0 129.0 94.0 45.0
16: 61.0 101.0 133.0 61.0 180.0 160.0 161.0 136.0 106.0 62.0 35.0 17.0
17: 7.0 28.0 59.0 30.0 104.0 95.0 90.0 67.0 33.0 2.0 0.0 1.0
18: 0.0 0.0 4.0 3.0 34.0 35.0 22.0 8.0 0.0 0.0 0.0 0.0
19: 0.0 0.0 0.0 0.0 1.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0
20: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
-------------------------------------------------------------------------
av 74.9 103.6 128.3 107.5 167.7 160.8 146.5 127.1 123.1 97.1 74.0 49.9
--------------------------------------------------------------------------
9. Monthly Average Hourly Dry Bulb Temperatures [deg F]:
--------------------------------------------------------------------------
Hr JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
-- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1: 43.0 31.0 36.0 63.0 69.0 81.0 81.0 77.0 78.0 53.0 59.0 45.0
2: 42.0 30.0 36.0 63.0 66.0 78.0 79.0 75.0 76.0 52.0 57.0 45.0
3: 42.0 28.0 34.0 60.0 62.0 76.0 78.0 74.0 73.0 51.0 55.0 44.0
4: 41.0 28.0 35.0 60.0 61.0 74.0 78.0 73.0 72.0 51.0 55.0 44.0
5: 41.0 23.0 34.0 58.0 61.0 72.0 79.0 73.0 71.0 52.0 55.0 43.0
6: 40.0 24.0 35.0 55.0 58.0 70.0 78.0 72.0 70.0 51.0 55.0 43.0
7: 39.0 25.0 35.0 52.0 57.0 74.0 77.0 74.0 71.0 52.0 54.0 43.0
8: 39.0 25.0 34.0 56.0 62.0 78.0 78.0 76.0 73.0 50.0 52.0 44.0
9: 38.0 31.0 39.0 58.0 72.0 82.0 79.0 78.0 74.0 58.0 51.0 45.0
10: 44.0 37.0 43.0 62.0 77.0 87.0 81.0 81.0 78.0 65.0 57.0 50.0
11: 49.0 44.0 45.0 62.0 79.0 93.0 85.0 83.0 83.0 73.0 63.0 56.0
12: 55.0 48.0 48.0 70.0 82.0 98.0 86.0 86.0 87.0 77.0 69.0 62.0
13: 58.0 53.0 50.0 74.0 85.0 99.0 89.0 88.0 89.0 79.0 72.0 64.0
14: 61.0 53.0 53.0 75.0 86.0 101.0 92.0 89.0 91.0 80.0 75.0 65.0
15: 64.0 54.0 54.0 68.0 87.0 102.0 93.0 91.0 93.0 81.0 78.0 66.0
16: 64.0 55.0 56.0 57.0 89.0 102.0 93.0 92.0 93.0 82.0 76.0 67.0
17: 65.0 54.0 55.0 53.0 90.0 102.0 95.0 93.0 93.0 82.0 75.0 66.0
18: 65.0 54.0 54.0 52.0 89.0 102.0 95.0 94.0 93.0 80.0 73.0 65.0
19: 61.0 52.0 51.0 52.0 88.0 100.0 95.0 92.0 89.0 76.0 69.0 63.0
20: 58.0 48.0 48.0 51.0 85.0 98.0 94.0 89.0 84.0 74.0 65.0 60.0
21: 54.0 45.0 46.0 48.0 81.0 96.0 86.0 87.0 80.0 71.0 61.0 58.0
22: 51.0 43.0 45.0 49.0 77.0 94.0 84.0 85.0 79.0 66.0 59.0 57.0
23: 48.0 41.0 38.0 48.0 74.0 91.0 84.0 83.0 78.0 62.0 56.0 55.0
24: 45.0 39.0 36.0 47.0 72.0 89.0 82.0 81.0 77.0 58.0 54.0 54.0
--------------------------------------------------------------------------
av 50.3 40.2 43.3 58.0 75.4 89.1 85.0 82.7 81.0 65.7 62.3 54.3
--------------------------------------------------------------------------
In case you do not have the hourly readings, you can still plot on the psychrometric chart in which case you will want to get the maxima and the minima for each month. This also means you will be able to use only two values of relative humidity as well (max and min).
Using the max. and min. values is ok as far as you realize that when you plot them on the psychrometric chart, you will get straight lines instead of areas, allowing you only seasonal assessment and NOT diurnal. ( we will discuss this again as we do the actual plotting)
10. Monthly Average Hourly Wet Bulb Temperatures [deg F.]:
--------------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1: 38.0 24.0 28.0 47.0 50.0 55.0 72.0 71.0 61.0 49.0 48.0 37.0
2: 38.0 24.0 26.0 46.0 48.0 54.0 72.0 69.0 60.0 48.0 47.0 37.0
3: 37.0 22.0 25.0 44.0 46.0 53.0 71.0 68.0 58.0 48.0 47.0 37.0
4: 37.0 22.0 26.0 44.0 46.0 52.0 70.0 68.0 58.0 47.0 47.0 37.0
5: 37.0 19.0 25.0 42.0 45.0 51.0 70.0 68.0 58.0 48.0 47.0 37.0
6: 36.0 19.0 26.0 41.0 44.0 50.0 71.0 67.0 57.0 48.0 47.0 37.0
7: 36.0 20.0 26.0 40.0 43.0 52.0 70.0 68.0 58.0 48.0 46.0 37.0
8: 36.0 20.0 25.0 48.0 46.0 54.0 70.0 69.0 59.0 46.0 46.0 38.0
9: 35.0 24.0 29.0 49.0 51.0 56.0 71.0 70.0 60.0 50.0 45.0 37.0
10: 39.0 29.0 31.0 49.0 52.0 59.0 71.0 70.0 61.0 53.0 48.0 41.0
11: 42.0 33.0 32.0 46.0 52.0 62.0 72.0 70.0 63.0 54.0 50.0 45.0
12: 44.0 34.0 33.0 51.0 53.0 64.0 73.0 70.0 65.0 56.0 53.0 49.0
13: 46.0 38.0 34.0 52.0 54.0 64.0 72.0 70.0 63.0 57.0 54.0 48.0
14: 47.0 37.0 36.0 54.0 55.0 64.0 74.0 70.0 61.0 56.0 55.0 48.0
15: 49.0 37.0 37.0 51.0 55.0 64.0 72.0 70.0 60.0 56.0 56.0 48.0
16: 49.0 38.0 37.0 49.0 56.0 64.0 72.0 70.0 60.0 57.0 55.0 48.0
17: 49.0 38.0 37.0 46.0 57.0 64.0 74.0 70.0 59.0 57.0 55.0 48.0
18: 49.0 38.0 36.0 47.0 56.0 64.0 72.0 70.0 58.0 58.0 55.0 48.0
19: 48.0 36.0 35.0 47.0 56.0 64.0 72.0 69.0 57.0 57.0 54.0 47.0
20: 46.0 34.0 33.0 47.0 55.0 64.0 71.0 70.0 55.0 56.0 52.0 46.0
21: 45.0 32.0 33.0 47.0 53.0 63.0 72.0 70.0 54.0 55.0 51.0 45.0
22: 43.0 31.0 32.0 48.0 51.0 63.0 72.0 70.0 55.0 53.0 50.0 44.0
23: 42.0 30.0 28.0 47.0 50.0 63.0 72.0 70.0 57.0 51.0 50.0 44.0
24: 40.0 29.0 27.0 46.0 49.0 63.0 72.0 70.0 58.0 50.0 49.0 43.0
--------------------------------------------------------------------------
av 42.0 29.5 30.7 47.0 51.0 59.4 71.7 69.5 59.0 52.4 50.3 42.7
--------------------------------------------------------------------------
11. Monthly Average Hourly Relative Humidities [%]:
--------------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1: 64.9 35.9 35.9 29.2 25.1 17.3 66.0 75.6 38.9 76.6 45.6 47.5
2: 71.1 43.2 21.1 25.5 25.2 19.5 72.4 75.0 40.5 76.2 48.4 47.5
3: 64.2 40.1 24.9 25.8 28.1 20.2 72.1 74.7 41.6 81.7 56.5 52.7
4: 70.5 40.1 26.7 25.8 30.9 21.0 68.5 78.4 44.2 75.8 56.5 52.7
5: 70.5 53.4 24.9 23.3 27.0 21.9 65.3 78.4 47.0 76.2 56.5 58.3
6: 69.8 43.8 26.7 28.1 31.7 22.9 72.1 78.2 46.3 81.7 56.5 58.3
7: 76.6 45.4 26.7 33.8 30.5 21.0 71.8 74.7 47.0 76.2 55.8 58.3
8: 76.6 45.4 24.9 57.3 28.1 19.5 68.5 71.5 44.9 75.3 65.0 59.1
9: 76.1 35.9 26.5 54.0 21.9 18.2 68.8 68.4 45.6 58.6 64.3 47.5
10: 65.6 37.4 20.6 39.9 15.9 18.0 62.6 59.3 38.9 46.4 53.1 47.0
11: 57.2 28.1 18.3 28.1 13.0 16.7 54.8 53.9 34.0 28.8 40.7 42.8
12: 41.8 17.8 12.8 26.0 11.4 15.0 55.3 46.6 31.6 26.5 34.9 39.8
13: 40.0 20.7 11.3 21.0 10.0 14.0 45.5 42.3 23.8 26.0 31.0 30.1
14: 35.0 16.1 11.7 24.8 10.9 12.2 44.4 40.3 17.1 21.0 28.0 27.5
15: 34.0 13.2 13.3 30.7 9.8 11.4 37.7 36.5 13.0 19.6 25.0 25.1
16: 33.9 14.8 8.1 58.0 9.7 11.4 37.7 34.8 13.0 21.0 26.0 22.8
17: 31.1 17.6 10.6 60.3 10.6 11.4 38.7 33.1 11.2 21.0 28.2 25.1
18: 31.0 17.6 9.0 70.6 9.7 11.4 34.3 31.5 9.4 26.0 32.0 27.5
19: 39.0 14.5 13.0 70.6 10.7 13.1 34.3 32.5 11.5 31.0 38.5 29.1
20: 40.0 17.8 12.8 75.8 12.1 15.0 33.7 40.3 13.2 33.0 42.0 33.7
21: 51.0 18.2 20.0 93.4 12.6 15.3 52.3 44.4 16.3 37.0 52.0 35.9
22: 53.0 20.5 18.3 93.6 13.4 17.4 57.4 48.9 20.4 43.0 55.0 34.8
23: 62.0 23.3 24.8 93.4 15.5 21.1 57.4 53.9 27.4 48.0 67.2 41.8
24: 66.3 26.4 28.5 93.3 16.1 23.9 63.0 59.3 32.2 59.0 72.8 40.8
--------------------------------------------------------------------------
av 55.1 28.6 19.6 49.3 17.9 17.0 55.6 55.5 29.5 48.6 47.1 41.1
--------------------------------------------------------------------------
12. Monthly Average Hourly Surface Wind Speeds [mph]:
--------------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1: 5.0 9.0 5.0 6.0 8.0 7.0 13.0 5.0 7.0 3.0 9.0 6.0
2: 6.0 3.0 7.0 3.0 6.0 8.0 13.0 5.0 8.0 7.0 11.0 9.0
3: 7.0 9.0 7.0 2.0 7.0 8.0 5.0 5.0 9.0 5.0 13.0 10.0
4: 6.0 5.0 10.0 6.0 9.0 9.0 13.0 5.0 8.0 7.0 12.0 9.0
5: 5.0 3.0 8.0 6.0 8.0 10.0 13.0 6.0 7.0 6.0 10.0 7.0
6: 5.0 3.0 1.0 2.0 7.0 10.0 15.0 7.0 6.0 11.0 9.0 6.0
7: 5.0 3.0 7.0 1.0 10.0 10.0 9.0 6.0 5.0 8.0 9.0 6.0
8: 6.0 7.0 6.0 5.0 10.0 9.0 7.0 5.0 5.0 9.0 8.0 7.0
9: 7.0 7.0 9.0 10.0 9.0 8.0 7.0 5.0 5.0 8.0 7.0 8.0
10: 5.0 3.0 10.0 5.0 6.0 9.0 7.0 5.0 5.0 5.0 7.0 6.0
11: 2.0 0.0 13.0 1.0 5.0 10.0 6.0 5.0 6.0 5.0 8.0 5.0
12: 0.0 3.0 3.0 9.0 5.0 10.0 8.0 6.0 7.0 11.0 8.0 3.0
13: 2.0 5.0 9.0 10.0 10.0 9.0 11.0 6.0 10.0 16.0 7.0 2.0
14: 3.0 3.0 7.0 23.0 6.0 7.0 13.0 7.0 14.0 7.0 6.0 1.0
15: 5.0 10.0 13.0 21.0 14.0 6.0 10.0 8.0 17.0 9.0 6.0 0.0
16: 6.0 5.0 10.0 25.0 10.0 6.0 0.0 11.0 14.0 10.0 9.0 2.0
17: 8.0 3.0 14.0 17.0 14.0 6.0 11.0 14.0 11.0 5.0 13.0 3.0
18: 9.0 3.0 13.0 15.0 11.0 7.0 14.0 17.0 8.0 17.0 16.0 5.0
19: 8.0 3.0 7.0 7.0 13.0 11.0 13.0 13.0 8.0 10.0 13.0 5.0
20: 6.0 3.0 5.0 14.0 10.0 15.0 15.0 10.0 7.0 9.0 9.0 6.0
21: 5.0 3.0 5.0 14.0 10.0 20.0 15.0 6.0 7.0 6.0 6.0 7.0
22: 6.0 5.0 3.0 15.0 8.0 20.0 7.0 6.0 8.0 6.0 6.0 6.0
23: 8.0 6.0 7.0 2.0 8.0 20.0 8.0 6.0 9.0 6.0 7.0 5.0
24: 9.0 7.0 6.0 2.0 5.0 20.0 11.0 7.0 10.0 8.0 8.0 5.0
--------------------------------------------------------------------------
av 5.6 4.6 7.7 9.2 8.7 10.6 10.2 7.3 8.5 8.1 9.0 5.4
--------------------------------------------------------------------------
13. Monthly Ave. Hourly Surface Wind Directions [ø clockwise from North]:
--------------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1:247.0 180.0 247.0 90.0 202.0 180.0 135.0 157.0 225.0 157.0 112.0 157.0
2:315.0 112.0 270.0 292.0 157.0 157.0 180.0 157.0 202.0 112.0 112.0 135.0
3: 0.0 135.0 270.0 112.0 135.0 157.0 180.0 135.0 180.0 202.0 90.0 112.0
4: 45.0 180.0 247.0 247.0 157.0 135.0 157.0 157.0 157.0 157.0 112.0 135.0
5: 90.0 157.0 315.0 225.0 157.0 135.0 157.0 157.0 157.0 157.0 135.0 135.0
6:157.0 157.0 270.0 90.0 157.0 135.0 157.0 180.0 157.0 180.0 135.0 135.0
7:157.0 157.0 337.0 315.0 157.0 135.0 135.0 180.0 157.0 157.0 135.0 135.0
8:157.0 135.0 225.0 292.0 157.0 135.0 180.0 180.0 157.0 112.0 135.0 135.0
9:157.0 180.0 247.0 292.0 157.0 135.0 247.0 180.0 157.0 157.0 112.0 135.0
10: 90.0 157.0 337.0 337.0 157.0 135.0 337.0 135.0 112.0 135.0 135.0 180.0
11: 45.0 0.0 337.0 0.0 315.0 135.0 0.0 112.0 45.0 112.0 135.0 225.0
12: 0.0 315.0 315.0 135.0 337.0 157.0 315.0 67.0 0.0 112.0 157.0 247.0
13: 22.0 22.0 0.0 157.0 315.0 90.0 0.0 22.0 337.0 112.0 157.0 292.0
14: 45.0 337.0 337.0 225.0 22.0 22.0 0.0 337.0 337.0 45.0 157.0 315.0
15: 67.0 45.0 270.0 247.0 315.0 337.0 337.0 270.0 315.0 135.0 157.0 0.0
16: 45.0 247.0 270.0 315.0 247.0 0.0 0.0 270.0 315.0 90.0 202.0 0.0
17: 22.0 45.0 270.0 337.0 292.0 22.0 270.0 270.0 337.0 45.0 270.0 0.0
18: 0.0 315.0 315.0 0.0 270.0 67.0 315.0 247.0 337.0 0.0 315.0 0.0
19:292.0 292.0 315.0 337.0 270.0 67.0 45.0 247.0 315.0 0.0 270.0 337.0
20:247.0 112.0 337.0 315.0 270.0 90.0 337.0 247.0 270.0 315.0 247.0 315.0
21:180.0 90.0 292.0 0.0 270.0 112.0 180.0 270.0 247.0 337.0 202.0 270.0
22:157.0 90.0 247.0 292.0 247.0 112.0 202.0 225.0 202.0 270.0 180.0 270.0
23:135.0 112.0 202.0 135.0 292.0 112.0 180.0 202.0 135.0 180.0 180.0 247.0
24:112.0 112.0 157.0 292.0 157.0 112.0 180.0 180.0 90.0 157.0 157.0 247.0
--------------------------------------------------------------------------
av 116.0 153.5 267.9 211.6 217.2 119.7 176.1 193.8 206.0 143.2 166.6 173.3
--------------------------------------------------------------------------
14. Monthly Average Hourly Diffuse Radiation on Hz Surface [BTU/ft2]
--------------------------------------------------------------------------
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Hr ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
2: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
3: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
4: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
5: 0.0 0.0 0.0 0.0 5.0 4.0 1.0 0.0 0.0 0.0 0.0 0.0
6: 0.0 0.0 2.0 14.0 29.0 29.0 16.0 9.0 7.0 0.0 0.0 0.0
7: 2.0 4.0 30.0 38.0 38.0 37.0 43.0 36.0 32.0 20.0 12.0 5.0
8: 26.0 31.0 35.0 40.0 43.0 41.0 42.0 39.0 36.0 30.0 25.0 22.0
9: 22.0 29.0 36.0 43.0 49.0 48.0 41.0 42.0 37.0 26.0 21.0 22.0
10: 19.0 25.0 42.0 43.0 52.0 51.0 42.0 46.0 41.0 26.0 18.0 20.0
11: 18.0 28.0 44.0 72.0 54.0 52.0 44.0 47.0 43.0 28.0 17.0 21.0
12: 17.0 30.0 45.0 105.0 54.0 52.0 44.0 51.0 43.0 27.0 16.0 35.0
13: 18.0 30.0 44.0 117.0 54.0 50.0 44.0 57.0 41.0 25.0 17.0 59.0
14: 19.0 26.0 41.0 109.0 51.0 48.0 45.0 56.0 37.0 26.0 19.0 61.0
15: 21.0 27.0 36.0 90.0 47.0 48.0 48.0 50.0 36.0 30.0 23.0 41.0
16: 24.0 31.0 35.0 57.0 40.0 51.0 47.0 44.0 37.0 29.0 22.0 16.0
17: 5.0 15.0 31.0 29.0 37.0 48.0 44.0 37.0 24.0 1.0 0.0 1.0
18: 0.0 0.0 3.0 3.0 22.0 27.0 17.0 6.0 0.0 0.0 0.0 0.0
19: 0.0 0.0 0.0 0.0 1.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0
20: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
21: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
22: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
23: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
24: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
--------------------------------------------------------------------------
av 8.0 11.5 17.7 31.7 24.6 24.5 21.6 21.7 17.3 11.2 7.9 12.6
Next, we will do the first thing one does on a psychrometric chart -
plot the comfort zone.
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